/*
 * Copyright 2022 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.mantisrx.server.master.client;

/**
 * ResourceLeaderConnection helps create a connection with the leader resource. You create a connection using the
 * register method and on subsequent changes to the leader resource, the listener gets notified so that the caller
 * can perform appropriate actions as necessary.
 *
 * @param <ResourceT> type of the resource being connected to.
 */
public interface ResourceLeaderConnection<ResourceT> {
    ResourceT getCurrent();

    void register(ResourceLeaderChangeListener<ResourceT> changeListener);

    interface ResourceLeaderChangeListener<ResourceT> {
        void onResourceLeaderChanged(ResourceT previousResourceLeader, ResourceT newResourceLeader);
    }
}
